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Finding the Fourth Proportional to 1,006.62, 1,388.10 and 785.19

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Solution

The fourth proportional to 1,006.62, 1,388.10 and 785.19 is: 1,082.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.62 : 1,388.10 = 785.19 : x
  2. Step 2: Convert to fraction form
    1,006.62/1,388.10 = 785.19/x
  3. Step 3: Cross multiply
    1,006.62x = 1,388.10 × 785.19
  4. Step 4: Simplify right side
    1,006.62x = 1,089,922.24
  5. Step 5: Solve for x
    x = 1,089,922.24/1,006.62
  6. Step 6: Final answer
    x = 1,082.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.